These high-quality AECO ABP-1111R banana plugs are sold in packs of 4 and feature an ingenious design incorporating top-of-the-range materials. The contacts of these banana plugs are made of 99% pure copper with rhodium plating for enhanced conductivity and resistance to corrosion and oxidation. Their body is solid. The POM (polyoxymethylene) head lock and internal plastic sheath act as insulation. They can be assembled either by screwing or welding. The removable structure of these banana plugs facilitates assembly by soldering. They accept conductors with a diameter of 5mm or less for solder mounting, or conductors with a diameter of 3.5mm or less for screw mounting.